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| Titel |
Evolving flood patterns in a Mediterranean region (1301-2012) and climatic factors – the case of Catalonia |
| VerfasserIn |
A. Barrera-Escoda, M. C. Llasat |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 1 ; Nr. 19, no. 1 (2015-01-26), S.465-483 |
| Datensatznummer |
250120604
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| Publikation (Nr.) |
 copernicus.org/hess-19-465-2015.pdf |
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| Zusammenfassung |
| Data on flood occurrence and flood impacts for the last seven centuries in
the northeastern Iberian Peninsula have been analysed in order to
characterise long-term trends, anomalous periods and their relationship with
different climatic factors such as precipitation, general circulation and
solar activity. Catastrophic floods (those that produce complete or partial
destruction of infrastructure close to the river, and major damages in the
overflowed area, including some zones away from the channels) do not present
a statistically significant trend, whereas extraordinary floods (the channel
is overflowed and some punctual severe damages can be produced in the
infrastructures placed in the rivercourse or near it, but usually damages are slight) have seen
a significant rise, especially from 1850 on, and were responsible for the
total increase in flooding in the region. This rise can be mainly attributed
to small coastal catchments, which have experienced a marked increase in
developed land and population, resulting in changes in land use and greater
vulnerability. Changes in precipitation alone cannot explain the variation in
flood patterns, although a certain increase was shown in late summer–early
autumn, when extraordinary floods are most frequently recorded. The
relationship between the North Atlantic circulation and floods is not as
strong, due to the important role of mesoscale factors in heavy precipitation
in the northwest of the Mediterranean region. However, it can explain the
variance to some extent, mainly in relation to the catastrophic floods
experienced during the autumn. Solar activity has some impact on changes in
catastrophic floods, with cycles related to the quasi-biennial oscillation
(QBO) and the Gleissberg solar cycle. In addition, anomalous periods of high flood
frequency in autumn generally occurred during periods of increased solar
activity. The physical influence of the latter in general circulation
patterns, the high troposphere and the stratosphere, has been analysed in
order to ascertain its role in causing floods. |
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